Uniquely, the 2013 edition was not only the final event in the series, but also incorporated the World Series Core Team Qualifier. In Sevens Series terminology, "core teams" are those that are guaranteed a place in all series events in a given season. Unlike all other series events, the 2013 London Sevens had only 12 teams competing for series points, namely the top 12 core teams on the season points table following the season's penultimate tournament, the Scotland Sevens. The Core Team Qualifier involved eight teams—the winner of the HSBC Asian Sevens Series; four teams advancing from the World Series Pre-Qualifier, held as part of the Hong Kong Sevens; and the three core teams at the bottom of the season table after the Scotland Sevens. The top three teams at the end of the Core Team Qualifier became core teams for the next season.
World Rugby, then known as the International Rugby Board, chose to change its core team qualifying process in advance of the 2013–14 series, reducing the number of promotion/relegation places from three to one, and also using only the Hong Kong Sevens for the core team qualifier. Accordingly, the London Sevens returned to its traditional 16-team format from 2014 forward.